Transient electromagnetic real-time dynamic advanced detection method and system based on magnetic gradient tensor

A magnetic gradient tensor and advanced detection technology, applied in the field of exploration geophysics, can solve the problem of asynchronous data acquisition and processing, and achieve the effect of improving effectiveness and accuracy and avoiding resolution.

Active Publication Date: 2020-09-25
CHINA UNIV OF MINING & TECH +1
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Problems solved by technology

At the same time, the general transient electromagnetic advanced detection method adopts the traditional operation method, and the data collection and data processing are not synchronized.

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  • Transient electromagnetic real-time dynamic advanced detection method and system based on magnetic gradient tensor
  • Transient electromagnetic real-time dynamic advanced detection method and system based on magnetic gradient tensor
  • Transient electromagnetic real-time dynamic advanced detection method and system based on magnetic gradient tensor

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Embodiment Construction

[0040] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0041]The water-conductive structures that threaten water inrush in coal mines, such as collapsed columns, faults, karsts, water-logged goafs, etc., can all be regarded as electrical low-resistance anomalies. When excited by a step current, eddy currents that decay with time will be generated on each anomalous body, and transient electromagnetic fields that change with time will be generated in the surrounding space. By equating the transient electromagnetic field into a series of continuous static magnetic fields, each anomalous body is equivalent to a series of magnetic bodies or magnetic dipoles in the time dimension, and the low resistance can be judged by observing the three-component electromagnetic gradient tensor. The orientation of the abnormal body. Therefore, the location of the magnetic gradient tensor anomaly is ...

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Abstract

The invention discloses a transient electromagnetic real-time dynamic advanced detection method and system based on a magnetic gradient tensor, and belongs to the field of exploration geophysics. Themethod comprises the steps: enabling a transient electromagnetic field to be equivalent to a series of continuous static magnetic fields, enabling a water conduction structure to be equivalent to a magnetic dipole body, directly observing magnetic field intensity components of a secondary field in x, y and z directions through five observation points which are arranged in the center of a roadway space and form a cross-shaped measuring line, and performing pairwise differential combination to obtain a magnetic gradient tensor; performing inversion calculation through the obtained magnetic gradient tensor to realize positioning of the magnetic dipole. According to the invention, data processing is directly carried out based on the magnetic gradient tensor, the precision and the accuracy arehigher than those of a scalar measurement and inversion method, and the device is simple, has instantaneity and can be effectively applied to advanced detection and monitoring of hidden water inrush disaster-causing factors in the roadway tunneling and working face mining process.

Description

technical field [0001] The invention relates to the field of exploration geophysics, in particular to a transient electromagnetic real-time dynamic advanced detection method and system based on magnetic gradient tensor. Background technique [0002] At present, in the process of roadway / tunnel excavation, the transient electromagnetic method is widely used to detect conductive / water-bearing structures in advance. For the roadway / tunnel space with small cross-section, the ring sector scanning technology is mostly used, that is, multiple detection directions are arranged at different angles on the excavation working face, and the induction coil is used to observe the secondary field induced electromotive force response signals in each direction, and then the apparent resistance Rate calculation and time-depth conversion, drawing fan-shaped apparent resistivity contour maps, and inferring water anomalies according to the relative magnitude of apparent resistivity values [1,2] ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/08
CPCG01V3/08
Inventor 姜志海王垚白亚东刘树才张永宏闫照涛岳建华安百州
Owner CHINA UNIV OF MINING & TECH
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